ECMWF ORAP5 (1979-2013).

Date Range: 1979-2013Data assimilated: Temperature and Salinity profiles from the EN3 v2a database with XBT bias correction, including XBT, CTD, Argo, Mooring, and from realtime GTS thereafter. Along track altimeter sea level anomalies and global trends from AVISO. SST and sea-ice are from the ERA-40 archive (before Auguest 1981), OSTIA analysis (1985-2007) and operational real-time OSTIA (2009 to 2013). For the period when OSTIA is not available the 1/4 degree daily NOAA OIv2d analysis is used.Assimilation method: NEMOVAR in its 3D-Var FGAT mode. The assimilation window is 5 days. A bias correction scheme is used to correct the model/forcing errors.

Forcing and relaxation used: All the surface forcing fields are from ECMWF ERA-Interim atmospheric reanalysis product, with addititional wave fields.

ECMWF ORAS4 (1958-present). Vintage 2010

Date Range: 1958-near presentData assimilated: Temperature and Salinity profiles from the from the EN3 v2a XBT bias corrected database (1958-2009), including XBT, CTD, Argo, Mooring, and from realtime GTS thereafter. Along track altimeter sea level anomalies and global trends from AVISO. SST and sea-ice are from the ERA-40 archive prior to November 1981, from the NCEP OI v2 weekly product (1981 until December 2009) and , and from OSTIA analysis from January 2010 onwards.The SST and sea-ice information is used to constrain the upper level ocean temperature via a newtonian relaxation scheme.Assimilation method: NEMOVAR in its 3D-var FGAT mode. The assimilation window is 10 days. A bias correction scheme is used to correct the model/forcing errors.

Forcing and relaxation used: Daily surface fluxes of heat, momentum and fresh water are used. Prior to 1989, the surface fluxes are from the ERA-40 atmospheric reanalysis. From the period 1989-2009, the surface fluxes are from ERA-Interim reanalysis. From 2010 onwards, when ORAS4 started operational running, daily surface fluxes were derived from the operational ECMWF atmospheric analysis.

University of Reading UR025.3 (1989 – 2010)

Model: NEMO coupled ice-ocean model v2.3

Configuration: ORCA025_LIM2 (1/4o by 46 vertical levels)

Data assimilated: UR025.3 assimilates in situ temperature and salinity observations that were obtained from the UK Met Office quality controlled ENACT/ENSEMBLES (EN3_v2a) dataset available from (http://www.metoffice.gov.uk/hadobs/en3/). A detailed description of the data set including the quality control processing is presented in Ingleby and Huddleston (2007).

Assimilation method: Temperature profiles (T) are assimilated along with a salinity balancing increment following the method of Troccoli and Haines, 1999). Salinity profiles (S) are then assimilated along isotherms (i.e., S(T)) up to latitudes of around 50oN/S, using the methodology described by Haines et al. (2006). At higher latitudes salinity is assimilated in a univariate way on z levels. Model – data differences (innovations) are evaluated at the closest model time step, and assimilation increments are calculated every 5 days. Increments are then introduced into the model evenly over the following day (Incremental Analysis Updating, Bloom et al., 1996). Smith and Haines (2009) give more details of the assimilation methodology.

Surface Forcing: Surface atmospheric forcing for UR025.3 is obtained from ECMWF ERA-Interim atmospheric reanalysis (Simmons et. al., 2007; Dee and Uppala, 2009; Dee et al., 2011). The ERA-Interim reanalysis provides 10-m wind, 2-m air humidity and 2-m air temperature to compute 6-hourly turbulent air/sea and air/sea-ice fluxes during model integration, using the bulk formula proposed by Large and Yeager (2004, 2009). Downwelling short and long wave radiative fluxes and precipitation are also provided by ERA-Interim. The river runoff is Dai and Trenberth (2002). To prevent drift in the density distributions, a sea surface salinity relaxation to the WOA05 climatology, Boyer et al (2006), is applied with a timescale of 180 days for the top 10 m at the ice-free surface, decreasing to 36 days under ice.

Assimilation method: The data assimilation methodology is similar to what is currently employed in the UK Met Office operational FOAM – NEMO system (Storkey et al., 2010).

It is an Optimal Interpolation (OI)– type scheme (Lorenc et al., 1991) with assimilation increments calculated using a first-guess-at-appropriate-time (FGAT) scheme every 5 days (73 assimilation cycles per year) and introduced evenly over the period in an incremental analysis update (IAU, [Bloom et al. 1996]) step.

Surface Forcing: The model is forced with the ECMWF ERA-Interim atmospheric reanalysis (10 m wind, 2 m air humidity and temperature, downwelling short and long wave radiation, precipitation and snow) with bulk fluxes calculated as Large and Yeager (2004, 2009). The monthly climatological river runoff of Dai and Trenberth (2002) is applied along the land mask. There is no sea surface salinity restoring in UR025.4.

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I'm looking for ocean zonal mean meridional streamfunction output, but have not been able to find it online. Does anyone know if this output field is provided by any ocean reanalysis group, or if perhaps someone has calculated it and made it publicly available?

I am trying to download SODAsi.3 netcdf files. They are available at http://abcmgr.tamu.edu/, but need to be all download in "full". Therefore, I am trying to access them through Opendap at this address: http://sodaserver.tamu.edu/opendap/, but can't get it to work by any mean.

I am looking for mixed layer changes (and possibly nitrates) over summer for Laptev, East Siberian and Chukchi seas (Chukchi being the most important).
I would like data for 2012 until present if possible.
Would this be possible?
Thanks

I want dialy data of ocean reanalysis for the indian ocean region. I far as i know GODAS providing pentad data and ECCO2 provides 3-day averages, please let me know where can i get the daily ocean reanalysis data. Thank You.

Hi Mr. Paul,
I don't know of any daily ocean reanalyses specifically, but if you look here: http://icdc.zmaw.de/projekte/easy-init/easy-init-ocean.html there are 20-30 listed. This information is a provided as part of the Copernicus Marine Environment Monitoring Service.
Best of Luck,
Steve

Depends what your intended use is? Are you interested in a solution that is as close as possible to the data, a solution that is property conserving and does not contain discontinuities, or a solution that is as physically realistic as possible?

Leo,
Please include what variables you need and over what time range, i.e.,
daily wind stress from 1979 onwards.
best wishes,
gil compo
U. of Colorado/CIRES & NOAA Earth System Research Laboratory/Physical Sciences Division

I need SODA reanalysis latest version for my research. I was unable to download from here. Is there any way that I can get this data for free ? I need, zonal, meridional, vertical winds and temperature data.

Dear Sirs,
we have available a high resolution ocean re-analysis for the period 1985-2007 at 1/16 degree resolution and we make it availabel through ftp to many users. The reference publication is:
Adani, Mario, Srdjan Dobricic, Nadia Pinardi, 2011: Quality Assessment of a 1985–2007 Mediterranean Sea Reanalysis. J. Atmos. Oceanic Technol., 28, 569–589., doi:10.1175/2010JTECHO798.1
We will be interested to put the information about our re-analysis on this web site, is it possible?
Best regards
Nadia

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